RL_RX_8139_BUF_RESERVE
RL_RX_8139_BUF_RESERVE);
sc->rl_cdata.rl_rx_buf += RL_RX_8139_BUF_RESERVE;
(ETHER_MAX_LEN + ETHER_VLAN_ENCAP_LEN + RL_RX_8139_BUF_RESERVE)